Hello, I hope this is the right forum for this post.
Last winter I cut this plant practically to the ground because it was invaded by this same critter (fungus?). Before doing that I used a product containing Potassium salts of Fatty Acids (Safer Brand for Organic Gardening) to try to kill whatever was ailing it, and did not succeed. By the way I freaked out at the warning label, really? For Organic gardening? Lots of warnings of all kinds... Now, almost six months later, with lots of healthy new growth on it, I realize there are leaves at the very bottom that have this powdery/sticky substance (picture attached).
I have not been able to see any bugs or critters crawling on the plant, someone had mentioned thrips but I was never able to identify them. I live in Northern California. Any suggestions? Thanks in advance.